Improved metallic roofing



dimite tratta @aient @twine DAVID SALNDERSON, OF ST. LOUIS, ASSIGNS ONE-HALF HIS RIGHT 'IO A. B. IWI' THOMPSON, OFWEBSTER GROVES, 'MISSOURL Lette/rs Potent No. 90,589, dated May 25, 1869.

The Schedule referred to in these Letters Patent and making part of the same.

To all .whom it may concern Be it known that I, DAVID SAUNDERSON, of the l city and county of St. Louis, in the State of Missouri,

The drawings represent a roof in process of being covered in accordance with my method and invention, which consist in laying down metallic plates in such manner as to form joints, or points of union, running .diagonally upon the roof, on a line of forty-tive degrees with the ridge-pole and eaves of the building, and so adjusting the nails in the metal as to provide against damage vby the swelling or shrinking thereof.

The letter B of the drawings represents a portion of the roof, upon which the metal roong has been laid by my process, and letter A is a strip of metallic plate, in process of being laid.

The process of laying down these plates is as follows: The-operator commences at one of the lower corners of the roof', say, for example, the lower right-hand corner, and nails down a small plate, in the form shown at a on the drawings. He next lays a course in the manner shown at c, and overlapping the strip or course a. This process is continued, the course being laid overlapping the course last 1aid,.nntil the roof is cornpleted, all the courses being upon diagonal lines, as shown.

In order to cover up the nails and, at the same time, adapt them to the changes of weather, I punch slots through the plate, when folded, as shown at C, the slots passing through the folds.' I then pass the nails into the roof-boards, through the slots O, and fold the metal over the nail-heads.

The folds thus created form ridges upon the roof, which give it, when painted, the appearanoeof a slate roof, laid with great regularity, and, by the process described, a thoroughly water-tight roof is formed of metallic plates, without the use of solder.

The slots C Aallow the plates to shrink or swell, without damage to the roof, nasmuch as they afford space around the nails, adapted to such shrinkage and swelling, without interfering with the nails themselves.

In laying down these courses, the operator'must be careful to break joints as he would if covering a roof with shingles.

Whenever the foregoing directions are followed, and suitable material used, a roof will be formed thoroughly water-tight, presenting a handsome external appearance, and well guarded against damage by expansion or contraction of the metal.

What I claim as my invention, and desire to secure by Letters Patent` is- 'Ihe method, herein described, of laying metallic rooting, when the sheets A are provided with slots for the nails, the strips, or sheetsbeing `nailed and bent so as to cover the nail-heads, substantially as and for the purposes specified.

DAVID SAUNDERSON.

Witnesses:

WM. M. ECOLES, GEO. W. HALL. 

